('CID100021307', 4),CARBOXIN
('CID100021307', 4),Carboxin [ANSI:BSI:ISO]
('CID100021307', 4),Carboxine
('CID100021307', 4),Carboxine [ISO-French]
('CID100185917', 2),Captan-carboxin mixt.
('CID100185917', 2),Carboxin-captan mixt.
ldiff: defaultdict(<type 'list'>, {'CID100185917': [13, 13], 'CID100021307': [0, 15, 1, 14]})
f1: [0, 15, 1, 14]
f2: [13, 13]
c1: Counter({0: 1, 1: 1, 14: 1, 15: 1})
c2: Counter({13: 2})
The chosen was ... CID100021307